Commented Issue: Typing not allowed in ComboBox until list shown [27350]

Notice if you place the cursor in the TextBox on the http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/ComboBox/ComboBox.aspx page that you cannot type anything until one of the items in the drop down list is selected. This can be corrected by adding __" && this._optionListItems.length == 0"__ to the if statement below "prevent typing when there are no items in the list" on line 834 of the ComboBox.pre.js file:

```
// prevent typing when there are no items in the list
if (this.get_selectedIndex() == -1 && this.get_dropDownStyle() == Sys.Extended.UI.ComboBoxStyle.DropDownList && this._optionListItems.length == 0) {
this.get_textBoxControl().value = '';
e.preventDefault();
e.stopPropagation();
return false;
}

```

Comments: The combobox (version 3.5.50731.0) works fine in firefox (tested with version 6.0) but version 4.1.7.123 and/or above do not allow typing in the textbox, neither after showing the list nor after selecting an item from the list. I figured no problem with Google Chrome (Version 24.0.1312.57 m) in both of the versions. Even the solution suggested above to modify line 834 of ComboBox.pre.js does not solve this bug.